Girl Giant and the Monkey King by Van Hoang
Eleven-year-old Thom Ngoh is keeping a secret: She's strong. Like, suuuuper strong. Freakishly strong. And it's making it impossible for Thom to fit in at her new middle school. In a desperate bid to get rid of her super strength, she makes a deal with the Monkey King, a powerful deity and legendary trickster. Thom will help him get back his magical staff if he'll take away her strength. Soon she is swept up in a centuries-old world where demons, dragons, and Jade princesses actually exist. But Thom quickly discovers that magic can't cure everything, and dealing with the trickster god might be more trouble than it's worth.